Joseph martin



Patented Feb. 10, 1841 J. MARTIN. HYDRANT 000K.

UNITED STATES PATENT OFFICE.

JOSEPH MARTIN, OF BALTIMORE, MARYLAND, ASSIGNOR TO EBENEZER H.I-IUBBABL;

METHOD OF CONSTRUCTING COCKS FOB HYDRANTS OR OTHER PURPOSES BY PRODUCINGA PERPENDICULAR LIFT OF THE PISTON.

Specification of Letters Patent No. 1,972, dated February 10, 1841. 1 1V T 0 all whom it may concern:

Be it known that I, Josnrrr MARTIN, of the city of Baltimore and Stateof Waryland. have invented a new and useful Improvement in theConstruction of Cocks for Hydrants and other Purposes, which isdescribed as follows, reference being had to the annexed drawings of thesame, making part of this specification.

Figure 1 is an elevation, Fig. 2 section, F 3 plan of plate 5, Fig. 4plan of stock I. Fig. revolving cap detached, Fig. 6 section of femalescrew, Fig. 7 piston rod detached.

Similar letters refer to similar parts in the figures.

The cylinder A, tubes B, piston and screw C for securing the piston aremade in the usual manner.

The improvement consists principally in the revolving screw cap D andits mode of action in the top coupling causing the screw head piston rodE to be lifted vertically in a square opening N in a circular plate I)screwed to this stock I without its having any horizontal movement-thuspreventing the wear of the piston and consequent leakage as heretoforeexperienced.

The cap D is made hollow to admit a nut l shaped on the outside like afrustum of a cone and the inside formed into a female screw tocorrespond with a male screw on the upper end of the piston rod which isto rise and fall therein and which nut is in creased in diameter nearthe larger end to form a shoulder S upon which the cap is to rest andstill more increased in diameter at the lower end just below saidshoulder, forming a circular tongue T which is to turn in a circulargroove formed in the stock in the manner hereafter described. The cap Dis likewise enlarged in diameter at the lower end so as to form acircular rim R which rests upon the shoulder of the not before mentionedover which shoulder said rim projects or hangs thus forming a circulargroove around the outside of the nut into which a tongue K of the stockenters and over which the cap revolves the said cap and nut beingscrewed together so as to form one piece and turned by the same handleI-Ihorizontally upon a circular plate Z) screwed from the under side tothe stationary stock I by means of screws J J. In this plate 6 is madethesquare opening N in which the square part E of the piston rod risesand'falls and which prevents it from turning horizontally.

The casting I called the stock is a hollow cylinder open at the lowerend and closed at the upper end except when a square opening is left inthe plate I) for the square part of the piston rod to move in, which)late I) forms part of the closing head of the upper end of the saidcylindrical stock. The upper opening in the casting I is of the samediameter as the shoulder S of the nut. Below this part of the castingthe diameter of the opening is increased so as to form a seat for thecircular rim T of the nut which turns therein. Below this seat thediameter of the opening is again increased so as to form a seat for thecircular plate I).

The upper end of the piston rod E is a male screw corresponding inthread with the nut P which is made to turn over it to the right orleft. Below the male screw it is decreased in diameter forming acylindrcal neck and below this neck it is made square of greaterdiameter. The lower part is made in the usual manner. 7

To raise the piston rod to open the valve turn the cap D to the right.This Will cause the piston rod to rise verticallythe nut always turningon the plate 5. To close the valve turn the cap to the left which willscrew the rod down in a vertical position without having any horizontalor grinding movement upon the valve seat.

The invention claimed and desired to be secured by Letters Patentconsists in Lifting the valve vertically without any horizontal orgrinding movement on its seat by means of the before described revolvingscrew cap and screw head piston rod whether constructed and arrangedprecisely in the manner above described, or in any other modesubstantially the same.

JOSEPH MARTIN,

Witnesses SAM. PURVEANQY, WILLIAM WARFIELD,

